A skydiver weighing 60 kg moves through a distance of 40 m upwards in 2 seconds. The power spent by the skydiver due to its weight (in Watt) is ___ . ( $T a k e g = 9.8 m / s^{2}$ )

11670

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11760

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15460

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17600

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Solution

The correct option is B 11760
Power spent by the skydiver = $\frac{w o r k d o n e}{t i m e}$
Work done in 2 seconds = force $\times$ displacement
Since the force exerted is same as the weight of the skydiver, $F = m g = 60 \times 9.8 = 588 N$
Work done = force x displacement $= (588 \times 40) J$
So, power spent in 2 seconds $= (\frac{588 \times 40}{2}) W = 11760 W = 11.76 K W$

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